\begin{figure}[ht]
    \begin{tabular}{cc}
      
  \begin{minipage}[t]{0.4\hsize}
    \centering
    \begin{equation*}
      \frac{\Gamma, x:\tau_a \vdash e:\tau_b}{\Gamma \vdash \lambda x.e:\tau_a \to \tau_b }
    \end{equation*}\textrm{T-LAMBDA}
  \end{minipage} &
    
  \begin{minipage}[t]{0.5\hsize}
  \centering
     \begin{equation*}
       \frac{ \Gamma \vdash e_1:N \quad \Gamma \vdash e_2:\tau }{\Gamma \vdash delay\ e_1\ e_2 : \tau}
     \end{equation*}\textrm{T-DELAY}
  \end{minipage}\\
  
  \begin{minipage}[t]{0.4\hsize}
  \centering
  \begin{equation*}
    \frac{\Gamma, x : \tau_p \vdash e: \tau_p }{\Gamma \vdash feed\ x.e:\tau_p}
  \end{equation*}\textrm{T-FEED}
  \end{minipage}&
  
  \begin{minipage}[t]{0.5\hsize}
    \centering
       \begin{equation*}
         \frac{ \Gamma \vdash e_c : R\ \Gamma \vdash e_t:\tau\ \Gamma \vdash e_e:\tau }{\Gamma \vdash if\ (e_c)\ e_t\ e_e\ : \tau}
       \end{equation*}\textrm{T-IF}
    \end{minipage}\\

  \end{tabular}
    \caption{\label{fig:typing}{\it Excerpt of the typing rules for \lambdammm.}}
  \end{figure}